I am 31 years old and my ears are sensitive to treble and I have a soundstage fetish. The only difference I can tell between Mp3 and Flac is just a little bit of more air, separation and soundstage. Just a little bit. From blind test I can identify a Flac from Mp3 8/10 times.

Confused. You say you can only hear a little difference but also state you can pick out flac over mp3 80% of the time. The air, soundstage, and separation that you are hearing are desirable, correct? I'm fairly certain that's what you meant. Do you mean to say that even though the difference is small it is worthwhile to you?

That is pretty impressive, but statistically is still not significant in a blind test. For 95% confidence you would need 9/10, and you'd need to be able to produce it many times. https://en.wikipedia.org/wiki/ABX_test#Confidence

Yes, I mentioned that because I can pick out that little difference but my other audiophile friends can't most of the time. So, I think the small difference is really not a big deal unless your ears are sensitive to sibilance and soundstage.
I would like to add that the DAC and cans play a major role. Some are meant to reveal the tiny difference.

I was taking -1/+1 consideration. How many times would you take the test to say that this is enough? A percentage in this regard can't be accurate. IMO

To have 95% confidence which is considered scientifically significant (the kind you could publish) that article says 10 times. The idea is that if you flip a coin 10 times, sure its a 50/50 but you could still pretty easily end up with 8 heads and 2 tails... so even though 80% sounds great that just as easily be a fluke. If you can get 9/10 after 10 tests, you can say with 95% certainty that its actually you hearing the difference. Crazy right? I couldn't believe it takes that many.

Remember this is a per person test. It doesn't help us any if 200 people can get 9/10, sure it means there is likely a difference to detect, but if 1 person can get 9/10 10 times (90/100 total) that is pretty significant.

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